This is the Apple Service Level I Technical Procedures #072-0062 Vol II (Jan 1986 edition) binder. It contains troubleshooting, take-apart, and preventive maintenance technical procedures; and illustrated parts lists for a number of Apple disk drives, including the Disk II Drive, Disk /// Drive, Apple ProFile, DuoDisk and UniDisk drives, Macintosh External Drive (400K and 800K), HardDisk 20, and UniDisk 3.5. There was also a section of the ImageWriter technical procedures inserted – probably by mistake, but I included it in this PDF anyway.